Since my original posting I have discovered that the doors I want to replace are in fact solid UPVC frames not Aluminium coated as I said previously. If your company supplies these I would be grateful for an address, email and phone number.

Just for the record U.P.V.C. is (Ultra Poly Vinyl Coated) whatever ...normally aluminium profile but seeing solid Plastic that has great strength and of course doesnt rust, or needs painting and remains white even in bright sunlight ( Ultra violet stable )